PROPERTY, PLANT, AND EQUIPMENT (Tables)

6 Months Ended

Jun. 30, 2020

Property, Plant and Equipment [Abstract]

Schedule of Property, plant and equipment, net

The estimated useful lives of property, plant and equipment are as follows:

(In thousands)	Estimated Useful Life	June 30, 2020		December 31, 2019
Property, plant and equipment	​	​		​
Land	n/a	$	4,466	$	4,466
Leasehold and building improvements	(1)	111,778		80,352
Land improvements	15 years	2,399		1,766
Buildings	30 - 40 years	165,926		112,815
Computer equipment and computer software	3 years	74,447		65,323
Laboratory equipment	3 - 10 years	130,323		104,008
Furniture and fixtures	3 - 10 years	22,698		14,539
Assets under construction	n/a	61,628		149,687
Property, plant and equipment, at cost	​	573,665		532,956
Accumulated depreciation	​	(110,228)		(77,631)
Property, plant and equipment, net	​	$	463,437	$	455,325

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(1)Lesser of remaining lease term, building life, or estimated useful life.